You need to run test mode 37
Place the unit in test mode like this
Wait 20 - 30 sec. after connecting to mains.
By means of keyboard from St.by mode: Press Display 0 2 5 8 with no more than 2 sec. between the individual enterings.
Then enter 37
Press Standby to exit testmode.
Option setting will be returned to 1 and you will have normal keyboard control.
CD memory should not be affected.